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Date:   Tue, 05 Jul 2022 16:20:12 +0000
To:     Petr Machata <>
Subject: Re: [PATCH iproute2 v2] ip: Fix size_columns() invocation that passes a
 32-bit quantity


This patch was applied to iproute2/iproute2.git (main)
by Stephen Hemminger <>:

On Tue, 28 Jun 2022 12:17:31 +0200 you wrote:
> In print_stats64(), the last size_columns() invocation passes number of
> carrier changes as one of the arguments. The value is decoded as a 32-bit
> quantity, but size_columns() expects a 64-bit one. This is undefined
> behavior.
> The reason valgrind does not cite this is that the previous size_columns()
> invocations prime the ABI area used for the value transfer. When these
> other invocations are commented away, valgrind does complain that
> "conditional jump or move depends on uninitialised value", as would be
> expected.
> [...]

Here is the summary with links:
  - [iproute2,v2] ip: Fix size_columns() invocation that passes a 32-bit quantity

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